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Earnings per share (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Earnings per share |  |
Net income from continuing operations attributable to Consolidated Water Co. Ltd. stockholders | $ 8,554,923 | $ 10,177,662
Less: preferred stock dividends | (11,937) | (12,356)
Net income from continuing operations available to common shares in the determination of basic earnings per common share | 8,542,986 | 10,165,306
Total income from discontinued operations | 3,621,170 | 1,115,825
Net income available to common shares in the determination of basic earnings per common share | $ 12,164,156 | $ 11,281,131
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders (in shares) | 15,025,639 | 14,962,760
Weighted average number of preferred shares outstanding during the period (in shares) | 33,983 | 35,125
Potential dilutive effect of unexercised options and unvested stock grants | 77,454 | 76,262
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders | 15,137,076 | 15,074,147

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